From eca84e99d1afac871cd85b3444862f36fa8bbb37 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Mon, 10 Oct 2016 11:27:19 +0300 Subject: [PATCH] serial: 8250_lpss: Try to enable Memory-Write-Invalidate Enable MWI mechanism if PCI bus master supports it. Signed-off-by: Andy Shevchenko Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_lpss.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/tty/serial/8250/8250_lpss.c b/drivers/tty/serial/8250/8250_lpss.c index 353c90e..ac2a34e 100644 --- a/drivers/tty/serial/8250/8250_lpss.c +++ b/drivers/tty/serial/8250/8250_lpss.c @@ -184,6 +184,7 @@ static void qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port) return; pci_set_master(pdev); + pci_try_set_mwi(pdev); /* Special DMA address for UART */ dma->rx_dma_addr = 0xfffff000; -- 2.7.4